diff -Nuar a/CMakeLists.txt b/CMakeLists.txt
--- a/CMakeLists.txt	2017-12-08 04:02:08.000000000 +0300
+++ b/CMakeLists.txt	2017-12-17 11:30:46.413624475 +0300
@@ -46,7 +46,7 @@
 set(KDEPIM_LIB_VERSION "${KDEPIM_VERSION_NUMBER}")
 set(KDEPIM_LIB_SOVERSION "5")
 
-set(QT_REQUIRED_VERSION "5.8.0")
+set(QT_REQUIRED_VERSION "5.7.1")
 find_package(Qt5 ${QT_REQUIRED_VERSION} CONFIG REQUIRED Widgets)
 
 
